99 Yukon Replaced the Fuel Pressure Regulator and now.....

Ok I had my truck into the shop last week and They replaced the FPR and
wanted to do an injector cleaning for $100. I declined the injector
cleaning hoping to run some Injector cleaner through a tank of gas.

When I got the truck back it started 100% better but ran way way worse.
It is now misfiring so much that I have conciderably noticable loss in
power. The truck doesn't seem to be shifting the same, probably due to
the loss of power. Anyway is it possible that a working FPR would
cause the truck to run conciderably worse. Before the FPR was replaced
I had extended crank and a rough idle but plenty of power and it was
responsive. Now it is rough idle no power and un-responsive. Any
advice? Could they have put the distributer on a little off or
something. I heard here that this could cause a problem if you weren't
careful on these engines.
TIA
Corey

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